Study of the mechanisms of uptake of 5-aminolevulinic acid derivatives by PEPT1 and PEPT2 transporters as a tool to improve photodynamic therapy of tumours

The International Journal of Biochemistry & Cell Biology
Lorena RodriguezAdriana G Casas

Abstract

Endogenous porphyrin accumulation after administration of 5-aminolevulinic acid is employed in photodynamic therapy of tumours. Due to its low membrane permeability, esterified 5-aminolevulinic acid derivatives less hydrophilic than the parental compound are under investigation. Knowledge of the mechanisms of 5-aminolevulinic acid derivatives uptake into target cells is essential to understand and improve photodynamic therapy and useful in the design of new derivatives with better affinity and with higher selectivity for tumour cells in specific tissues. The aim of this work was to assess the interaction of 5-aminolevulinic acid derivatives with the intestinal PEPT1 and renal transporter PEPT2 expressed in Pichia pastoris yeasts. We found that Undecanoyl, Hexyl, Methyl and 2-(hydroxymethyl)tetrahydropyranyl 5-aminolevulinic acid esters and the dendron 3m-ALA inhibited (14)C-5-aminolevulinic acid uptake by PEPT2. However, only the Undecanoyl ester inhibited 5-aminolevulinic acid uptake by PEPT1. We have also found through a new developed colorimetric method, that Hexyl and 2-(hydroxymethyl)tetrahydropyranyl 5-aminolevulinic acid esters display more affinity than 5-aminolevulinic acid for PEPT2 whereas none of the compounds surpa...Continue Reading

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